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From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Subject: Re: gnat project "include file"
Newsgroups: comp.lang.ada
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Date: Tue, 8 Dec 2009 09:42:20 +0100
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Date: 2009-12-08T09:42:20+01:00
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On Mon, 7 Dec 2009 10:27:54 -0800 (PST), Zircona wrote:

> I got a projet which are multiple project.. Some of them have
> dependency to the other.
> Is there a way to change the with command to used an environment
> variable?

You do not need to change it. The project itself can depend on the
variable(s), i.e. instead of different versions of the same project X, you
make X dependent on the scenario variables.

E.g.:

project X is

   type Development_Type is ("Debug", "Release");
   Development : Development_Type := external ("Development", "Debug");

   type Platform_Type is ("x86_Windows", "x86_VxWorks");
   Platform : Platform_Type := external ("Platform", "x86_Windows");

   case Platform is
      when "x86_Windows" =>
         for Source_Dirs use Dirs & "os/Windows/i586";
         case Development is
            when "Debug" =>
               for Object_Dir use "lib/x86/Windows/Debug";
            when "Release" =>
               for Object_Dir use "lib/x86/Windows/Release";
         end case;
      when "x86_VxWorks" =>
   ...
etc.

The project Y may simply

with "x.gpr";
project Y is
   ...

Y can share the variables Development and Platform. (Copy type and variable
declaration into Y, when necessary)

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de